MEXICO CITY -- Mexico's hyperviolent Zetas drug cartel appears to be launching what may be one of the first campaigns by an organized crime group to silence commentary on the Internet.

The cartel has already attacked rivals, journalists and other perceived enemies. Now, the target is an online chat room, Nuevo Laredo en Vivo, that allows users to comment on the activities of the Zetas and others in the city on the border with Texas.

Already, three apparent site users have been slain, and a fourth victim may have been discovered Wednesday, when a man's decapitated body was found with what residents said was a banner suggesting he was killed for posting on the site. Chat room users said they could not immediately confirm the victim's identity, because people all post under aliases.

Despite such precautions, users are highly vulnerable, and the Zetas could be tracking them from clues they leave online, experts said Thursday.

A female chat room user was found decapitated in September with a similar message as the one found Wednesday and at the exact same spot, with a message signed with the letter "Z," which refers to the Zetas. Residents couldn't fully read the latest message, because the dead man's body was laid on top of it, in what appeared to be a more hurried execution.

"I don't know of anything like this having happened anywhere else in the world," said Jorge Chabat, an expert in safety and drug trafficking at the Center for Research and Teaching in Economics in Mexico. "It is certainly new and worrisome ... it is a frontal confrontation against the public; it is not just a confrontation with the government anymore."

Drug cartels in Mexico have frequently attacked traditional print newspapers, by tossing explosives at their offices or killing, kidnapping or threatening reporters. Violence against journalists in Tamaulipas state, where Nuevo Laredo is located, has led local media to censor themselves, leaving residents on their own to separate fact from pervasive rumors spread on social networks.

Juan Carlos Romero, who helps lead the press freedom group Article 19, said local newspapers have often stopped publishing crime reports out of fear, leading residents to turn more to the Internet for information like that posted Thursday on Nuevo Laredo en Vivo: where gunshots have been heard, where vehicles suspected of carrying cartel lookouts have been seen, which streets are safe to travel.

"What are people doing in the face of the lack of information, the kind of information you need to make decisions: Where can I drive? Can I leave the house?" said Romero. "People are forging new channels of communication on the Internet, social networks, Twitter, blogs, Facebook."

Drug cartels appear to have learned that such Internet sites reach far more readers than northeastern Mexico's small regional newspapers and have adjusted their attacks accordingly.

"We are witnessing a new behavior of criminal forces in the country," said Erick Fernandez, a communications professor at the IberoAmerican University in Mexico City. "We are in a new phase."

Romero agreed. "It appears to me that organized crime is trying to get common citizens to stop real-time coverage of violence," he said, saying that "the intimidation is having a multiplier effect."

Some of the site users vowed to forge on despite the two decapitations and the September slayings of two other people whose bodies were found hanging from an overpass in Nuevo Laredo with a message threatening: "This is what will happen" to trouble-making Internet users. That message was also signed with a "Z."

"I am ready to lay down my life for the cause, if the soldiers take heed of my reports ... (if) the risk (serves) for something," said one user who posted under the tag "Anon5182."

Despite heightened security awareness among the site's users Thursday, with warnings not to share personal information with anyone, they remain tremendously vulnerable, said Matt Harrigan, chief executive of the San Diego, California-based security firm Critical Assets.

A trail of information like cookies, server addresses, login and account information was easy visible for some users.

"I know enough about (one user) that I'm uncomfortable with how much I know about (him) just from visiting the site," said Harrigan. "Just from having looked up information about him, the number of things I know about the guy is pretty staggering."

Harrigan said it would be relatively easy, with the money the Zetas have from running drugs, to track down posters.

"If you're a Mexican cartel with hundreds of millions of dollars, there certainly are security experts in Mexico or former hackers, or whoever they are, that I'm certain they're for hire," he said.

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Facts About Mexican Drug Cartel Zetas

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In the late 1990s, about 40 soldiers deserted the Mexican army special forces to work as muscle for the Gulf Cartel. After the cartel's leader was arrested, they branched out into their own, independent operation.

Los "Zetas" take their name from the police radio code for top army commanders, "Z1."

Heriberto Lazcano, also known as "The Executioner," heads the Zetas drug cartel. The U.S. has offered a reward of up to $5 million for information leading to his arrest.

The Zetas are responsible for some of the worst atrocities in Mexico's ongoing drug war, including allegedly dumping 35 bodies on an avenue in Veracruz and igniting a casino fire that killed 52 people in Monterrey.

According to Mexican officials, the Zetas may have has many as 10,000 members across Mexico, Central America, and the United States.